Engine Control System - Diagnosis
- How To Proceed With Troubleshooting
- Customer Problem Analysis Check
- Pre-Check
- Readiness Monitor Drive Pattern
- Diagnostic Trouble Code Chart
- Parts Location
- Terminals Of ECM
- Problem Symptoms Table
- Circuit Inspection
- DTC P0031: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1); DTC P0032: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 1); DTC P0037: Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 2); DTC P0038: Oxygen Sensor Heater Control Circuit High (Bank 1 Sensor 2); DTC P0051: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1); DTC P0052: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 1); DTC P0057: Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 2); DTC P0058: Oxygen Sensor Heater Control Circuit High (Bank 2 Sensor 2)
- DTC P0100: Mass Or Volume Air Flow Circuit; DTC P0102: Mass Or Volume Air Flow Circuit Low Input; DTC P0103: Mass Or Volume Air Flow Circuit High Input
- DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance Problem
- DTC P0110: Intake Air Temperature Circuit; DTC P0112: Intake Air Temperature Circuit Low Input; DTC P0113: Intake Air Temperature Circuit High Input
- DTC P0115: Engine Coolant Temperature Circuit; DTC P0117: Engine Coolant Temperature Circuit Low Input; DTC P0118: Engine Coolant Temperature Circuit High Input
- DTC P0116: Engine Coolant Temperature Circuit Range/Performance Problem
- DTC P0120: Throttle/Pedal Position Sensor/Switch "A" Circuit; DTC P0122: Throttle/Pedal Position Sensor/Switch "A" Circuit Low Input; DTC P0123: Throttle/Pedal Position Sensor/Switch "A" Circuit High Input; DTC P0220: Throttle/Pedal Position Sensor/Switch "B" Circuit; DTC P0222: Throttle/Pedal Position Sensor/Switch "B" Circuit Low Input; DTC P0223: Throttle/Pedal Position Sensor/Switch "B" Circuit High Input; DTC P2135: Throttle/Pedal Position Sensor/Switch "A"/"B" Voltage Correction
- DTC P0121: Throttle/Pedal Position Sensor/Switch "A" Circuit Range/Performance Problem
- DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control
- DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
- DTC P0130: Oxygen Sensor Circuit (Bank 1 Sensor 1); DTC P0150: Oxygen Sensor Circuit (Bank 2 Sensor 1); DTC P2195: Oxygen Sensor Signal Stack Lean (Bank 1 Sensor 1); DTC P2196: Oxygen Sensor Signal Stack Rich (Bank 1 Sensor 1); DTC P2197: Oxygen Sensor Signal Stack Lean (Bank 2 Sensor 1); DTC P2198: Oxygen Sensor Signal Stack Rich (Bank 2 Sensor 1)
- DTC P0133: Oxygen Sensor Circuit Slow Response (Bank 1 Sensor 1); DTC P0153: Oxygen Sensor Circuit Slow Response (Bank 2 Sensor 1)
- DTC P0134: Oxygen Sensor Circuit No Activity Detected (Bank 1 Sensor 1); DTC P0154: Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1)
- DTC P0136: Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2); DTC P0156: Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2)
- DTC P0171: System Too Lean (Bank 1); DTC P0172: System Too Rich (Bank 1); DTC P0174: System Too Lean (Bank 2); DTC P0175: System Too Rich (Bank 2)
- DTC P0230: Fuel Pump Primary Circuit
- DTC P0300: Random/Multiple Cylinder Misfire Detected; DTC P0301: Cylinder 1 Misfire Detected; DTC P0302: Cylinder 2 Misfire Detected; DTC P0303: Cylinder 3 Misfire Detected; DTC P0304: Cylinder 4 Misfire Detected; DTC P0305: Cylinder 5 Misfire Detected; DTC P0306: Cylinder 6 Misfire Detected; DTC P0307: Cylinder 7 Misfire Detected; DTC P0308: Cylinder 8 Misfire Detected
- DTC P0325: Knock Sensor 1 Circuit (Bank 1 Or Single Sensor); DTC P0330: Knock Sensor 2 Circuit (Bank 2)
- DTC P0335: Crankshaft Position Sensor "A" Circuit; DTC P0339: Crankshaft Position Sensor "A" Circuit Intermittent
- DTC P0340: Camshaft Position Sensor "A" Circuit (Bank 1 Or Single Sensor); DTC P0341: Camshaft Position Sensor "A" Circuit Range/Performance (Single Sensor)
- DTC P0351: Igniter Coil "A" Primary/Secondary Circuit; DTC P0352: Igniter Coil "B" Primary/Secondary Circuit; DTC P0353: Igniter Coil "C" Primary/Secondary Circuit; DTC P0354: Igniter Coil "D" Primary/Secondary Circuit; DTC P0355: Igniter Coil "E" Primary/Secondary Circuit; DTC P0356: Igniter Coil "F" Primary/Secondary Circuit; DTC P0357: Igniter Coil "G" Primary/Secondary Circuit; DTC P0358: Igniter Coil "H" Primary/Secondary Circuit
- DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2)
- DTC P0441: Evaporative Emission Control System Incorrect Purge Flow; DTC P0446: Evaporative Emission Control System Vent Control Circuit; DTC P2418: Evaporative Emission System Valve Control Circuit/Open
- DTC P0442: Evaporative Emission Control System Leak Detected (Small Leak); DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak); DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
- DTC P0451: Evaporative Emission Control System Pressure Sensor/Switch Range/Performance; DTC P0452: Evaporative Emission Control System Pressure Sensor/Switch Low Input; DTC P0453: Evaporative Emission Control System Pressure Sensor/Switch High Input
- DTC P0500: Vehicle Speed Sensor "A"; DTC P0503: Vehicle Speed Sensor "A" Intermittent/Erratic/High
- DTC P0504: Brake Switch "A"/"B" Correlation
- DTC P0505: Idle Air Control System
- DTC P0560: System Voltage
- DTC P0604: Internal Control Module Random Access Memory (Ram) Error; DTC P0606: ECM/Pcm Processor; DTC P0607: Control Module Performance; DTC P0657: Actuator Supply Voltage Circuit / Open
- DTC P0617: Starter Relay Circuit High
- DTC P2102: Throttle Actuator Control Motor Circuit Low; DTC P2103: Throttle Actuator Control Motor Circuit High
- DTC P2111: Throttle Actuator Control System - Stuck Open; DTC P2112: Throttle Actuator Control System - Stuck Closed
- DTC P2118: Throttle Actuator Control Motor Current Range/Performance
- DTC P2119: Throttle Actuator Control Throttle Body Range/Performance
- DTC P2120: Throttle/Pedal Position Sensor/Switch "D" Circuit; DTC P2122: Throttle/Pedal Position Sensor/Switch "D" Circuit Low Input; DTC P2123: Throttle/Pedal Position Sensor/Switch "D" Circuit High Input; DTC P2125: Throttle/Pedal Position Sensor/Switch "E" Circuit; DTC P2127: Throttle/Pedal Position Sensor/Switch "E" Circuit Low Input; DTC P2128: Throttle/Pedal Position Sensor/Switch "E" Circuit High Input; DTC P2138: Throttle/Pedal Position Sensor/Switch "D"/"E" Voltage Correlation
- DTC P2121: Throttle/Pedal Position Sensor/Switch "D" Circuit Range/Performance
- Cranking Hold Function Circuit
- ECM Power Source Circuit
- Fuel Pump Control Circuit
- Mil Circuit